|Round|Game|Date|Visitor|Score|Home|Score|OT|
|---|---|---|---|---|---|---|---|
|Preliminary Round|Bye|||||||
|Quarter-Finals|Game 1|13-Apr-75|Chicago Black Hawks|1|Buffalo Sabres|4||
|Quarter-Finals|Game 2|15-Apr-75|Chicago Black Hawks|1|Buffalo Sabres|3||
|Quarter-Finals|Game 3|17-Apr-75|Buffalo Sabres|4|Chicago Black Hawks|5|(OT)|
|Quarter-Finals|Game 4|20-Apr-75|Buffalo Sabres|6|Chicago Black Hawks|2||
|Quarter-Finals|Game 5|22-Apr-75|Chicago Black Hawks|1|Buffalo Sabres|3||
|Semi-Finals|Game 1|27-Apr-75|Montreal Canadiens|5|Buffalo Sabres|6|(OT)|
|Semi-Finals|Game 2|29-Apr-75|Montreal Canadiens|2|Buffalo Sabres|4||
|Semi-Finals|Game 3|1-May-75|Buffalo Sabres|0|Montreal Canadiens|7||
|Semi-Finals|Game 4|3-May-75|Buffalo Sabres|2|Montreal Canadiens|8||
|Semi-Finals|Game 5|6-May-75|Montreal Canadiens|4|Buffalo Sabres|5|(OT)|
|Semi-Finals|Game 6|8-May-75|Buffalo Sabres|4|Montreal Canadiens|3||
|Stanley Cup Finals|Game 1|15-May-75|Buffalo Sabres|1|Philadelphia Flyers|4||
|Stanley Cup Finals|Game 2|18-May-75|Buffalo Sabres|1|Philadelphia Flyers|2||
|Stanley Cup Finals|Game 3|20-May-75|Philadelphia Flyers|4|Buffalo Sabres|5|(OT)|
|Stanley Cup Finals|Game 4|22-May-75|Philadelphia Flyers|2|Buffalo Sabres|4||
|Stanley Cup Finals|Game 5|25-May-75|Buffalo Sabres|1|Philadelphia Flyers|5||
|Stanley Cup Finals|Game 6|27-May-75|Philadelphia Flyers|2|Buffalo Sabres|0||

Question: how many games went into ot or overtime?
Answer: 4